基于层次队列的全光缓存技术

Hierarchical Queueing Based Optical Buffer

为了解决全光分组交换机中的分组缓存问题,提出了一种基于层次队列的全光缓存技术.该技术利用了分组缓存以队列为基本数据结构的特点,将长度逐层翻倍的若干层光纤环存储器用交叉开关组织起来,并将每一层队列的中间部分存储在下一层存储器中,从而实现了一种高效、灵活的缓存机制.这种技术可以用于构造交换设备中各种用途的缓存器.器件复杂度与存储容量呈对数关系,能够提供对服务质量的支持,并可通过使用波分复用(WDM)技术成倍减少光纤使用量.

A hierarchical queueing based optical buffer (HQOB) is presented for all optical packet switches. HQOB is in a layered structure. Each layer is a fiber loop buffer group, whose fiber length is multiple of the previous layer. As packets are normally stored in queues, the middle part of a queue can be moved between adjacent layers when needed. Thus HQOB can simulate normal packet buffer with QoS support using much less FDL (fiber delay line) segments (proportional to the logarithm of the buffer depth). The amount of FDLs can be further reduced when WDM (wavelength division multiplexing) is employed.